Timing Marks on the 273 [66 Barracuda]

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Is your car a CAP car?

If so it might have a gismo like this.

If so the advance curve is very different then non CAP cars.

The 67 273 with CAP calls for 5 deg ATDC.which is very different than non CAP.

If you set it a 0 or 5 BTDC you should be ok to start.

Also if when you reattach the vacuum advance the engine speeds up there is carborator tuning that needs to be done.